#!/bin/sh
#
# tor - The Onion Router
#
# Startup/shutdown script for Tor.
#
# Written by Marco Bonetti <sid77@slackware.it>, heavily based on
# contrib/tor.sh, contrib/torctl and Debian init script.

# Check available file descriptors
if [ -r /proc/sys/fs/file-max ]; then
  SYSTEM_MAX=`cat /proc/sys/fs/file-max`
  if [ "$SYSTEM_MAX" -gt "80000" ]; then
    MAX_FILEDESCRIPTORS=32768
  elif [ "$SYSTEM_MAX" -gt "40000" ]; then
    MAX_FILEDESCRIPTORS=16384
  elif [ "$SYSTEM_MAX" -gt "10000" ]; then
    MAX_FILEDESCRIPTORS=8192
  else
    MAX_FILEDESCRIPTORS=1024
    cat << EOF

Warning: Your system has very few filedescriptors available in total.

Maybe you should try raising that by adding 'fs.file-max=100000' to your
/etc/sysctl.conf file.  Feel free to pick any number that you deem appropriate.
Then run 'sysctl -p'.  See /proc/sys/fs/file-max for the current value, and
file-nr in the same directory for how many of those are used at the moment.

EOF
  fi
else
  MAX_FILEDESCRIPTORS=8192
fi

tor_start() {
  mkdir -p /var/run/tor
  chown tor.tor /var/run/tor
  if [ -n "$MAX_FILEDESCRIPTORS" ]; then
    echo -n "Raising maximum number of filedescriptors (ulimit -n) to $MAX_FILEDESCRIPTORS"
    if ulimit -n "$MAX_FILEDESCRIPTORS" ; then
      echo "..."
    else
      echo ": FAILED."
    fi
  fi
  echo "Starting Tor..."
  /usr/bin/tor
}

tor_stop() {
  echo -n "Stopping Tor..."
  PID=`cat /var/run/tor/tor.pid 2>/dev/null`
  if [ -z "$PID" ]; then
    echo " not running."
    exit 0
  fi
  if kill -15 $PID; then
    echo " stopped."
  else
    sleep 1
    if kill -9 $PID; then
      echo " killed."
    else
      echo " error!"
      exit 1
    fi
  fi
}

tor_reload() {
  echo -n "Reloading Tor..."
  PID=`cat /var/run/tor/tor.pid 2>/dev/null`
  if [ -z "$PID" ]; then
    echo " not running."
    exit 0
  fi
  if kill -1 $PID; then
    echo " reloaded."
  else
    echo " error!"
    exit 1
  fi
}

tor_status() {
  PID=`cat /var/run/tor/tor.pid 2>/dev/null`
  if [ -z "$PID" ]; then
    echo "Not running."
    exit 1
  elif kill -0 $PID; then
    echo "Running."
    exit 0
  else
    echo "PID file /var/run/tor/tor.pid present but PID $PID is not running."
    exit 1
  fi
}

case "$1" in
  start)
    tor_start
  ;;

  stop)
    tor_stop
  ;;

  restart)
    tor_stop
    sleep 3
    tor_start
  ;;

  reload)
    tor_reload
  ;;

  status)
    tor_status
  ;;

  *)
  echo "Usage: $0 (start|stop|restart|reload|status)"
esac
